Alloy 260 Brass Specifications


Alloy 260 brass is a sheet metal that contains copper and zinc. This alloy is malleable and easy to cut and shape for both simple and highly technical applications. It is commonly found in homes in the form of name and address plates, hinges, ornaments, lamps, locks and brackets. It is also used in central heating systems, electronic components, and electrical equipment. Alloy 260 has become known as "cartridge brass" due to its use in gun ammunition.

Chemical Composition

  • The standards for Alloy 260 brass call for 68.5 to 71.5 percent copper, 28.5 to 31.5 percent zinc and no more than 0.05 percent each of iron and lead. In practice the ratio of copper to zinc is rounded off to 70-to-30, so that the alloy is often referred to as "70/30 brass."

Physical Properties

  • The solid melting point of Alloy 260 is 1,750 degrees Fahrenheit, and its liquid melting point is 1,680 degrees Fahrenheit. Its density at 68 degrees Fahrenheit is 308 lbs. per cubic inch, and its coefficient of thermal expansion --- change in volume when heated or cooled --- is 0.0000111 unit per degree Fahrenheit.

Properties when Annealed

  • Alloy 260 brass is annealed --- treated with heat followed by a cooling bath --- between 800 and 1,100 degrees Fahrenheit in order to enhance its natural strength as well as its heat and electrical conductivity. When it is annealed, Alloy 260 conducts heat at a rate of 70 BTU per square foot per hour per degree Fahrenheit based on a starting point of 68 degrees Fahrenheit. The electrical resistance of annealed wire made with Alloy 260 is 37 Ohms per foot of 1/1000 of an inch of diameter, or per circular mil, at 68 degrees Fahrenheit. Its electrical conductivity is measured at 26 to 28 percent at 68 degrees Fahrenheit.


  • The tensile strength of Alloy 260 is 43,000 pounds per square inch and the yield strength is 10,900 psi. Shear strength is 31,000 psi, shear torsion/modulus of rigidity is 6,000,000 psi and its modulus of elasticity --- amount of force needed to change its form by stretching --- is 16,000,000 psi.

Hardness and Flexibility

  • Alloy 260 brass has a Brinnell hardness score of 68 HB; this is about twice the score of copper and about five times that of aluminum. Its machinability rating is 30, making it one of the easiest types of brass to shape and cut.

Other Specifications and Characteristics

  • The ideal temperature for molding hot brass is from 1,300 to 1,450 degrees Fahrenheit. It has a smooth yellow finish that can be polished or brushed. It is easily cut and finished with polishing and buffing compounds, and it is known for its resistance to corrosion.

Related Searches


  • Photo Credit Jupiterimages/Creatas/Getty Images
Promoted By Zergnet


You May Also Like

  • Difference Between Steel & Brass Casing

    The cost of steel-cased ammunition is usually significantly less than rounds with brass casings, making it a tempting purchase for target practice....

  • How to Melt Brass

    1,688 degrees Fahrenheit is an extremely hot temperature; however, in metallurgy it is considered a low melting point. Compared to iron's melting...

  • How to Remove Spray Paint From Brass

    Spray painting generates an attractive finish, free from unsightly roller marks and brushstrokes. Unfortunately, this application technique also leads to over-spray stains...

  • Properties of Red Brass Material

    Red brass is a copper zinc alloy with nominal composition of 85 percent copper, 15 percent zinc, with some traces of iron...

  • Specifications on the 1982 International 260 Tractor

    International Harvester introduced its first Farmall tractor in 1924 to compete with the Fordson line. Now known as Navistar, this American agricultural...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!